U-lock - ορισμός. Τι είναι το U-lock
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Τι (ποιος) είναι U-lock - ορισμός

TYPE OF LOCK USED TO SECURE BIKES
U-lock; U lock; Bike Lock; Bike lock; Bicycle Lock; Bikelock; Sold Secure; O-lock
  • Frame and front wheel secured
  • Cable with combination lock
  • Simple cable lock (left) and steel-jacketed cable lock
  • Front wheel is locked with U-lock, but the rest of the bicycle is gone.

U-lock         
¦ noun another term for D-lock.
Lock (water navigation)         
  • Agde Round Lock
  • Operation of caisson lock
  • <u>Operation of a canal lock</u><br/>
1–3. Boat enters 'empty' lock<br/>
4. Bottom gates are closed, bottom paddles closed, top paddles opened, lock starts to fill<br/>
5. Lock is filling with water, lifting boat to the higher level
  • gates]]. The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
  • [[Dalmuir]] drop lock
  • Berendrecht Lock (right) and Zandvliet Lock (left), located at the entrance to the Port of Antwerp (top) from the Scheldt (foreground)
  • Lock on the River [[Neckar]] at [[Heidelberg]] in Germany
  • Iroquois Lock on the [[Saint Lawrence Seaway]]
  • A pound lock on the Keitele–[[Päijänne]] Canal at [[Äänekoski]] in [[Central Finland]]
  • Collection of lock windlasses. Note: rakes are for clearing trash out of the lock.
  • Hatton flight]] in England
  • Doubled locks. Left lock has boat in it, right lock (center of drawing) is empty. This is on the Erie Canal at Lockport.
  • Entrance to Minden shaft lock
  • The turf-sided [[Monkey Marsh Lock]] on the Kennet & Avon Canal at [[Thatcham]]
  • 180px
  • Model of early river pound lock, constructed in Lankheet water park, Netherlands
  • abbr=on}} in a lock
  • Snubbing a boat to keep it from hitting the downstream gates. Note the rope wrapped around the snubbing post.
  • [[Three Gorges Dam]] model view. A pair of five locking steps is at center with a ship lift to the left
  • [[Three Gorges Dam]] lock near [[Yichang]] on [[Yangtze]] river, China
  • Barges at a lock on the [[Mississippi River]]
FALL STRUCTURE WITH A FIXED CHAMBER IN WHICH THE WATER LEVEL CHANGES
Canal locks; Ship lock; Lock (canal); Lock and dam; Shiplock; Navigation lock; Pound lock; Lock (river); Locks (canal); Canal lock; Locks (water transport); Sea lock; Gate (water transport); Lock (ship); Ship locks; Mitre gate; Staircase locks; Shaft lock; Twin lock; Sluse; Sluser; Canal Lock; Lock gate; Lock navigation; Stop lock; Lock gates; Lock flight; Lock-chambers; Shipping lock; Lock chamber; Staircase lock; Lock (waterway); Lock (water transport); Lock (waterwat transport); Dock gate; Lock (water); Drop lock; Flight of locks; Lock flights; Lock paddle; Lock rise; Double lock
A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.
Lock (waltz)         
IN A WALTZ
Lock (Waltz); Back lock; Turning lock; Turning lock to right; Forward lock (waltz)
There are several types of lock step in waltz dancing, including International Standard waltz. A "lock step" is when the moving foot approaches to the standing foot and crosses in front of or behind it, creating a "check" position.

Βικιπαίδεια

Bicycle lock

A bicycle lock is a security device used to deter bicycle theft, either by simply locking one of the wheels or by fastening the bicycle to a fixed object, e.g., a bike rack.

Quick-release levers, as used on some bicycle wheels and seatpost fasteners, are a security vulnerability, because they allow the wheels and saddle to be easily removed. Unless such easily removable components are secured while the bicycle is unattended, they are vulnerable to theft. Sensible locking strategies address this by locking these components in addition to the frame, or by taking the vulnerable components, such as quick-release front wheels, away from the bicycle.

Locking devices vary in size and security, the most secure tending to be the largest, heaviest and least portable. Thus, like other security equipment, bicycle locks must balance the competing interests of security, portability, and cost. Some are made of particularly expensive materials chosen for their acceptable strength and low density.

An alternate defense is the provision of bicycle lockers or a bike cage in which the whole bicycle is locked, but these are uncommon in some countries. A bike locker is not a bicycle lock.

Test standards that rate the effective security of bicycle locks are provided by Thatcham and Sold Secure in the United Kingdom, ART in the Netherlands, SSF in Sweden, and VDS in Germany. Tests carried out by the Cyclists' Touring Club showed that all of the locks under test could be broken in less than 42 seconds using either bolt cutters for a cable/chain or a bottle jack for D-locks.

Παραδείγματα από το σώμα κειμένου για U-lock
1. Bike theft is a concern, and retailers say the only major lock manufacturer to offer a guarantee in the city is Kryptonite, maker of the New York Fahgettaboudit U–lock.